but in the process he took out that many tsa agents. if they were armed, chances are he wouldn't have gotten as far as he did, right? >> that's correct. >> based on what we know at this point, which is not a lot. >> that's right. a lot more -- we'll learn a lot more in the investigation. but maybe having armed officers, as they do, they do have armed officers in those public areas, is definitely very important to have critical and immediate response. >> you advise retailers, you advise shopping centers. of course, we're coming up upon this most important season for them. there's a balance to strike here, which is you can't be so oversecured you turn away the shoppers, as bill was mentioning earlier. how can retailers strike that balance? >> a proper combination of physical security measures, technology and humans.positioni that allows security personnel to detect perpetrators of violence, right then and there, before bad things happen, is essentially. it's technology, physical security measures and humans. >> you mentioned behavior dete